so i decided to change my minibow 2.5 light bulb (15W incandescent) to a fluorescent light. I know that 1W for fluorescent equals to more incandescent so i don't necessary need like 15W of fluorescent because that's like 60W of incandescent. But is it okay if i put a 15W fluorescent in where i put the 15W incandescent?

one more question: how long should i keep my fluorescent light on when i switch to it, and how many watt should i use for my 2.5 gallons tank because i don't want algae problem